feat(web): el selector de artículo de una línea admite varios (el primero completa la línea, los demás se insertan debajo)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/web/src/app/shared/grid/lines-grid.ts

@@ -55,6 +55,7 @@ export class LinesGrid {
   protected readonly lookupTarget = signal<LookupTarget | null>(null);
   protected readonly multiOpen = signal(false);
   protected readonly lookup = computed(() => this.lookupTarget()?.column.lookup?.config);
+  protected readonly lookupMultiple = computed(() => !!this.lookupTarget()?.column.lookup?.multiple);
 
   protected cellText(line: GridLine, column: GridColumn): string {
     if (column.format) return column.format(line);
@@ -216,7 +217,15 @@ export class LinesGrid {
     const picked = rows[0];
     const line = target ? this.lines()[target.row] : undefined;
     if (!target || !picked || !line || !target.column.lookup) return;
-    this.replace(target.row, target.column.lookup.apply(picked, line), target.column.key);
+    const lookup = target.column.lookup;
+    this.replace(target.row, lookup.apply(picked, line), target.column.key);
+    const rest = rows.slice(1).map((r) => {
+      const added = lookup.apply(r, this.newLine()());
+      return this.recalc()?.(added, target.column.key) ?? added;
+    });
+    if (rest.length) {
+      this.lines.update((ls) => [...ls.slice(0, target.row + 1), ...rest, ...ls.slice(target.row + 1)]);
+    }
   }
 
   protected lookupClosed(): void {